lags on high is settings and low fps

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I have city bus simulator 2010 my gpu is passed the recommeded requirement ,so i can not understand why the low fps .

I have HIS hd6770 1gb {which can play the newest demanding games on high except crysis and metro 2033} ,athlon 64 x2 5000+ @ 3ghz ,[which is equivalant to an core 2 duo mentioned on the back of city bus simulator 2010] and 2gb ram ddr2. the other thing is it doesnt make that much of a diffrenece if a lower the details and resolution,ive tried low ,high , medium and very high. And ive tried these resolutions: 1920x1080{this is my native resolution of my 24 inch samsung hdtv} ,16050x16080, 144x1333 , 1280x1204,1024x768 and last i tried 800x600 and aa make no diffrence niether did antroscopic filtering. the worst thing is when i install usedom, its even less playable . Is this games optimzed for nvidia or somthing . just wondered thats all